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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Dec. 31, 2003
Commitments and Contingencies Disclosure [Abstract]      
Equity method investment ownership percentage     45.00%
Deferred gain $ 39 $ 60  
Amortized deferred gain 6    
Interest expense 1    
S&P DJ Indices | CME Group
     
Related Party Transaction [Line Items]      
Revenues earned under license agreement $ 12    
Noncontrolling interest ownership by noncontrolling owners 27.00%